#pragma once 
#include <iostream>
#include <sys/socket.h>
#include <sys/types.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <cstring>
#include <pthread.h>
#include <unistd.h>

#include "Log.hpp"

#define BACKLOG 5
class TcpServer{
  public:
    static TcpServer* getInstance(int port){
      static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
      if(svr == nullptr){
        pthread_mutex_lock(&lock);
        if( svr == nullptr){
          svr = new TcpServer(port);
          svr->InitServer();
        }
        pthread_mutex_unlock(&lock);
      }
      return svr;
    }
    void InitServer(){
      Socket();
      Bind();
      Listen();
      LOG(INFO, "tcp_server init ... success!");
    }
    void Socket(){
      listen_sock = socket(AF_INET, SOCK_STREAM, 0);
      if(listen_sock < 0){
        LOG(FATAL, "socket error");
        exit(1);
      }
      int opt = 1;
      setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
      LOG(INFO, "create socket ... success!");
    }
    void Bind(){
      struct sockaddr_in local;
      memset(&local, 0, sizeof(local));
      local.sin_family = AF_INET;
      local.sin_port = htons(port_);
      local.sin_addr.s_addr = INADDR_ANY;

      if(bind(listen_sock, (struct sockaddr*)&local, sizeof(local)) < 0){
        LOG(FATAL, "bind error!");
        exit(2);
      }
      LOG(INFO, "bind socket ... success!");
    }
    void Listen(){
      if(listen(listen_sock, BACKLOG) < 0){
        LOG(FATAL, "listen socket error!");
        exit(3);
      }
      LOG(INFO, "listen socket ... success!");
    }
    int Sock(){
      return listen_sock;
    }
    ~TcpServer(){
      if(listen_sock >= 0){
        close(listen_sock);
      }
    }
  private:
    TcpServer(int port ):port_(port),listen_sock(-1)
      {}
    TcpServer(const TcpServer& s) = delete;
    int port_;
    int listen_sock;
    static TcpServer* svr;
};
TcpServer* TcpServer::svr = nullptr;
